var turnplate={
    restaraunts:[],				//大转盘奖品名称
    colors:[],					//大转盘奖品区块对应背景颜色
    outsideRadius:192,			//大转盘外圆的半径
    textRadius:155,				//大转盘奖品位置距离圆心的距离
    insideRadius:68,			//大转盘内圆的半径
    startAngle:0,				//开始角度

    bRotate:false				//false:停止;ture:旋转
};
/****************************************/

/****************************************/
$(document).ready(function(){

    //动态添加大转盘的奖品与奖品区域背景颜色
    /***************  径向渐变 ***************/
    //onload = function() {
    //    draw();
    //};
    //function draw() {
    //    var canvas = document.getElementById('c1');
    //    if ( ! canvas || ! canvas.getContext ) { return false; }
    //    var ctx = canvas.getContext('2d');
    //    ctx.beginPath();
    //    /* 设定渐变区域 */
    //    var grad  = ctx.createRadialGradient(70,70,20,70,70,70);
    //    /* 设定各个位置的颜色 */
    //    grad.addColorStop(0,'red');
    //    grad.addColorStop(0.5,'yellow');
    //    grad.addColorStop(1,'blue');
    //    ctx.fillStyle = grad;
    //    /* 还是画一个圆形！ */
    //    ctx.rect(0,0, 140,140);
    //    // ctx.arc(70,70, 70, 0, Math.PI*2);
    //    ctx.fill();
    //}
    /***********************************/
    turnplate.restaraunts = ["哎呀，  就差一点点了！", "满60 减6元", "满50 减5元", "满40 减4元", "满30 减3元","现金券 2元","满100减10元"];
    turnplate.colors = ["#f7fef6", "#fecd6f", "#fa747b", "#fecd6f","#fa757a","#fecd6f","#fa7c7a"];

    var rotateTimeOut = function (){
        $('#wheelcanvas').rotate({
            angle:0,
            animateTo:2160,
            duration:8000,
            callback:function (){
                alert('网络超时，请检查您的网络设置！');
            }
        });
    };

    //旋转转盘 item:奖品位置; txt：提示语;
    var rotateFn = function (item, txt){
        var angles = item * (360 / turnplate.restaraunts.length) - (360 / (turnplate.restaraunts.length*2));
        if(angles<270){
            angles = 270 - angles;
        }else{
            angles = 360 - angles + 270;
        }
        var level = "L"+(item-1) ;

        $.ajax({
            type:"GET",
            url:"/activity/Turntable",
            //async:true
            data:{Level:level,ActivityName:txt},
            success:function(data){
                $('#wheelcanvas').stopRotate();
                $('#wheelcanvas').rotate({
                    angle:0,
                    animateTo:angles+1800,
                    duration:8000,
                    callback:function (){
                        //alert(data.msg);
                        swal(data.msg);
                        turnplate.bRotate = !turnplate.bRotate;
                    }
                });
            },
            error:function(data){
                $('#wheelcanvas').stopRotate();
                $('#wheelcanvas').rotate({
                    angle:0,
                    animateTo:angles+1800,
                    duration:8000,
                    callback:function (){
                        //alert(data.msg);
                        swal( data.msg);
                        turnplate.bRotate = !turnplate.bRotate;
                    }
                });
            }
        });
    };

    $('.pointer').click(function (){
        if(turnplate.bRotate)return;
        turnplate.bRotate = !turnplate.bRotate;
        //获取随机数(奖品个数范围内)
        var item = rnd(1,turnplate.restaraunts.length);
        //奖品数量等于10,指针落在对应奖品区域的中心角度[252, 216, 180, 144, 108, 72, 36, 360, 324, 288]
        rotateFn(item, "activityType1");    //turnplate.restaraunts[item-1]
        /* switch (item) {
         case 1:
         rotateFn(252, turnplate.restaraunts[0]);
         break;
         case 2:
         rotateFn(216, turnplate.restaraunts[1]);
         break;
         case 3:
         rotateFn(180, turnplate.restaraunts[2]);
         break;
         case 4:
         rotateFn(144, turnplate.restaraunts[3]);
         break;
         case 5:
         rotateFn(108, turnplate.restaraunts[4]);
         break;
         case 6:
         rotateFn(72, turnplate.restaraunts[5]);
         break;
         case 7:
         rotateFn(36, turnplate.restaraunts[6]);
         break;
         case 8:
         rotateFn(360, turnplate.restaraunts[7]);
         break;
         case 9:
         rotateFn(324, turnplate.restaraunts[8]);
         break;
         case 10:
         rotateFn(288, turnplate.restaraunts[9]);
         break;
         } */
        console.log(item);
    });
});

function rnd(n, m){
    var random = Math.floor(Math.random()*(m-n+1)+n);
    return random;

}


//页面所有元素加载完毕后执行drawRouletteWheel()方法对转盘进行渲染
window.onload=function(){
    drawRouletteWheel();
};

function drawRouletteWheel() {
    var canvas = document.getElementById("wheelcanvas");
    if (canvas.getContext) {
        //根据奖品个数计算圆周角度
        var arc = Math.PI / (turnplate.restaraunts.length/2);
        var ctx = canvas.getContext("2d");
        //在给定矩形内清空一个矩形
        ctx.clearRect(0,0,422,422);
        //strokeStyle 属性设置或返回用于笔触的颜色、渐变或模式
        ctx.strokeStyle = "#FFBE04";
        //font 属性设置或返回画布上文本内容的当前字体属性
        ctx.font = '1.7em Microsoft YaHei';
        for(var i = 0; i < turnplate.restaraunts.length; i++) {
            var angle = turnplate.startAngle + i * arc;
            ctx.fillStyle = turnplate.colors[i];
            ctx.beginPath();
            //arc(x,y,r,起始角,结束角,绘制方向) 方法创建弧/曲线（用于创建圆或部分圆）
            ctx.arc(211, 211, turnplate.outsideRadius, angle, angle + arc, false);
            ctx.arc(211, 211, turnplate.insideRadius, angle + arc, angle, true);
            ctx.stroke();
            ctx.fill();
            //锁画布(为了保存之前的画布状态)
            ctx.save();

            //----绘制奖品开始----
            ctx.fillStyle = "#E5302F";
            var text = turnplate.restaraunts[i];


            var line_height = 17;
            //translate方法重新映射画布上的 (0,0) 位置
            ctx.translate(211 + Math.cos(angle + arc / 2) * turnplate.textRadius, 211 + Math.sin(angle + arc / 2) * turnplate.textRadius);

            //rotate方法旋转当前的绘图
            ctx.rotate(angle + arc / 2 + Math.PI / 2);

            /** 下面代码根据奖品类型、奖品名称长度渲染不同效果，如字体、颜色、图片效果。(具体根据实际情况改变) **/
            if(text.indexOf("M")>0){//流量包
                var texts = text.split("M");
                for(var j = 0; j<texts.length; j++){
                    ctx.font = j == 0?'bold 30px Microsoft YaHei':'16px Microsoft YaHei';
                    if(j == 0){
                        ctx.fillText(texts[j]+"M", -ctx.measureText(texts[j]+"M").width / 2, j * line_height);
                    }else{
                        ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
                    }
                }
            }else if(text.indexOf("M") == -1 && text.length>4){//奖品名称长度超过一定范围
                text = text.substring(0,4)+"||"+text.substring(4);
                var texts = text.split("||");
                for(var j = 0; j<texts.length; j++){
                    ctx.fillText(texts[j], -ctx.measureText(texts[j]).width / 2, j * line_height);
                }
            }else{
                //在画布上绘制填色的文本。文本的默认颜色是黑色
                //measureText()方法返回包含一个对象，该对象包含以像素计的指定字体宽度
                ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
            }

            //添加对应图标
            if(text.indexOf("积分")>0){
                var img= document.getElementById("shan-img");
                img.onload=function(){
                    ctx.drawImage(img,-15,10);
                };
                ctx.drawImage(img,-15,10);
            }else if(text.indexOf("谢谢参与")>=0){
                var img= document.getElementById("sorry-img");
                img.onload=function(){
                    ctx.drawImage(img,-15,10);
                };
                ctx.drawImage(img,-15,10);
            }
            //把当前画布返回（调整）到上一个save()状态之前
            ctx.restore();
            //----绘制奖品结束----
        }
    }
}
